import cv2 as cv
import numpy as np

cap = cv.VideoCapture(0)
while(1):
  # Take each frame
  _, frame = cap.read()
  # Convert BGR to HSV
  hsv = cv.cvtColor(frame, cv.COLOR_BGR2HSV)
  # define range of blue color in HSV
  lower_blue = np.array([110,50,50])
  upper_blue = np.array([130,255,255])
  # Threshold the HSV image to get only blue colors
  mask = cv.inRange(hsv, lower_blue, upper_blue)
  # Bitwise-AND mask and original image
  res = cv.bitwise_and(frame,frame, mask= mask)
  cv.imshow('frame',frame)
  cv.imshow('mask',mask)
  cv.imshow('res',res)
  k = cv.waitKey(5) & 0xFF
  if k == 27:
    break
cv.destroyAllWindows()